Ionic Liquids as Alternatives to Organic Solvents in Liquid-Liquid Extraction of Aromatics
Ionic Liquids as Alternatives to Organic Solvents in Liquid-Liquid Extraction of Aromatics
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离子液体作为芳烃液液萃取中有机溶剂的替代品
DOI：
10.1021/bk-2005-0902.ch005
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. B. Haan
中科院分区：
文献类型：
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作者：
G. W. Meindersma;J. G. Podt;M. Meseguer;A. B. Haan
离子液体L-乙基-3-甲基咪唑乙基硫酸盐和1，3-二甲基咪唑甲基硫酸盐适合于从甲苯/正庚烷混合物中萃取甲苯。用[EMIM]乙基硫酸酯分离甲苯/正庚烷的选择性随着原料中甲苯含量的降低而增加，在40℃时从13.4(95%甲苯)增加到55.3(5%甲苯)，在75℃时从8增加到35。使用[MMIM]甲硫酸酯时，选择性从40℃的6增加到67.8，75℃从11.4增加到55。由于离子液体的蒸汽压可以忽略不计，蒸发提取的碳氢化合物可以实现离子液体的回收。确定了提取的概念性工艺方案。初步计算表明，与使用环丁砜作为溶剂相比，离子液体的投资成本和能源成本都要低得多。
The ionic liquids l-ethyl-3-methylimidazolium ethylsulfate and 1,3-dimethylimidazolium methylsulfate are suitable for extraction of toluene from toluene/heptane mixtures. The selectivity for the toluene/heptane separationusing [emim] ethylsulfate increases with decreasing toluene content in the feed, from 13.4 (95% toluene) to 55.3 (5% toluene) at 40°C and from 8 to 35 at 75°C. With [mmim]methylsulfate the selectivity increases from 6 to 67.8 at 40°C and from 11.4 to 55 at 75°C. These selectivities are a factor of 2-3 higher compared to those obtained with sulfolane as the extractant. Because ionic liquids have a negligible vapour pressure, evaporating the extracted hydrocarbons could achieve the recovery of the ionic liquid. A conceptual process scheme for the extraction has been set up. Preliminary calculations show that both the investment costs and the energy costs will be considerably lower with ionic liquids compared to using sulfolane as the solvent.